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In the article by Westerhof et al (Westerhof N, Segers P, Westerhof BE. Wave separation, wave intensity, the reservoir-wave concept, and the instantaneous wave-free ratio: presumptions and principles. Hypertension. 2015;66:93–98. doi: 10.1161/HYPERTENSIONAHA.115.05567), which published online ahead of print May 26, 2015, and appeared in the July 2015 issue of the journal, corrections were needed.

On page 93, right column, first paragraph, lines 2–5 read, “We then discuss and demonstrate the inconsistencies of 2 WIA-based methods used to interpret arterial function: the reservoir-wave concept (RWC) and the Instantaneous wave-Free (pressure-flow) Ratio (iFR).” This has been changed to read, “We then discuss and demonstrate the inconsistencies of 2 WIA-based methods used to interpret arterial function: the reservoir-wave concept (RWC) and the Instantaneous wave-Free Ratio (iFR).”

On page 96, right column, the first sentence of the The Instantaneous Wave-Free Ratio section read, “The iFR is the ratio of pressure and flow in the latter 75% of diastole.” This has been changed to read, “The iFR is the ratio of pressures distal and proximal to a (coronary) stenosis, both averaged over the latter part of diastole, the presumed wave-free period.”